linux-kernel - [PATCH v5 2/2] drm/msm/dsi/phy: Define PHY_CMN_CLK

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Message-Id: <20250219-drm-msm-phy-pll-cfg-reg-v5-2-d28973fa513a@linaro.org>
Date: Wed, 19 Feb 2025 17:23:33 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Jonathan Marek <jonathan@...ek.ca>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Rob Clark <robdclark@...omium.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v5 2/2] drm/msm/dsi/phy: Define PHY_CMN_CLK_CFG[01]
 bitfields and simplify saving

Add bitfields for PHY_CMN_CLK_CFG0 and PHY_CMN_CLK_CFG1 registers to
avoid hard-coding bit masks and shifts and make the code a bit more
readable.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

---

Changes in v5:
1. Split part touching pll_7nm_register() to new patch.
2. Update commit msg.

Changes in v4:
1. Add mising bitfield.h include
2. One more FIELD_GET and DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL (Dmitry)

Changes in v3:
1. Use FIELD_GET
2. Keep separate bit_clk_div and pix_clk_div
3. Rebase (some things moved to previous patches)

Changes in v2:
1. New patch
---
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
index 2fca469b10b33ac2350de5ab8a606704e84800ea..5ef5bc252019486c6f24f256d88d69ad3f6c838b 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2018, The Linux Foundation
  */
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/iopoll.h>
@@ -572,11 +573,11 @@ static void dsi_7nm_pll_save_state(struct msm_dsi_phy *phy)
 	cached->pll_out_div &= 0x3;
 
 	cmn_clk_cfg0 = readl(phy_base + REG_DSI_7nm_PHY_CMN_CLK_CFG0);
-	cached->bit_clk_div = cmn_clk_cfg0 & 0xf;
-	cached->pix_clk_div = (cmn_clk_cfg0 & 0xf0) >> 4;
+	cached->bit_clk_div = FIELD_GET(DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_3_0__MASK, cmn_clk_cfg0);
+	cached->pix_clk_div = FIELD_GET(DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_7_4__MASK, cmn_clk_cfg0);
 
 	cmn_clk_cfg1 = readl(phy_base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
-	cached->pll_mux = cmn_clk_cfg1 & 0x3;
+	cached->pll_mux = FIELD_GET(DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL__MASK, cmn_clk_cfg1);
 
 	DBG("DSI PLL%d outdiv %x bit_clk_div %x pix_clk_div %x pll_mux %x",
 	    pll_7nm->phy->id, cached->pll_out_div, cached->bit_clk_div,
@@ -598,7 +599,8 @@ static int dsi_7nm_pll_restore_state(struct msm_dsi_phy *phy)
 	dsi_pll_cmn_clk_cfg0_write(pll_7nm,
 				   DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_3_0(cached->bit_clk_div) |
 				   DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_7_4(cached->pix_clk_div));
-	dsi_pll_cmn_clk_cfg1_update(pll_7nm, 0x3, cached->pll_mux);
+	dsi_pll_cmn_clk_cfg1_update(pll_7nm, DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL__MASK,
+				    cached->pll_mux);
 
 	ret = dsi_pll_7nm_vco_set_rate(phy->vco_hw,
 			pll_7nm->vco_current_rate,

-- 
2.43.0